Improvement in machines for testing pipes



W. WOOD.

MACHINES Fon TESTINGPIPE.

No.1827397. Patented sept.1'9,.1e7e.

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UNITED STATES PATENT OFFICE.

WALTERgWOOD, OF PHILADELPHIA,PENNSYLVANIA.v

IMPROVEMENT IN MACHINES FCIR'TESITINGPIPES.

i Specification forming part of Letters Patent No. 182,397, datedSeptember 19, 1876; application led August 3, 1876.

To all 'whom it may concern Be it known that I, WALTER WOOD, of the cityof Philadelphia, and State of Pennsylvania, have invented a newr anduseful Machine for Testing the Strength of Water, Gras, and other Pipes,of which the following is a specication:

The drawing represents a central longitudinal section of my machine. 4

The nature of my invention consists in the combination and arrangementof such devices as will, in a hydrostatic machine for testing thestrength of metallic pipes, instantly and effectively open and close theordinarily open ends of `such pipes,leaving, however, a suit-` ableaperture for the injection of the testingduid.

The construction of these devices is as follows: A suitable frame isformed by rigidly connecting together the heavy ends or disks A A' bymeans of the tie-rods B B', these rods being sunk or let into the upperand' lower parts of the disks A A', and being provided with shoulders ab, which prevent any lateral displacement of the disks. Upon the innersurface of the disk A is formed a cylinder, C, provided with apiston-rod, D, working through asuitable bearing, d, in the inner end ofthe cylinder, and carrying upon its outer end a solid piston-rod head,E. The

piston-rod is attached' at its inner end to a plate or disk, F, havingits outer face f smoothly and evenly finished.` This disk, in additionto being connected with the rod D, is

hung from or suspended by means of pulleys G traveling upon the uppertie-rod B', which forms a rail for the same. pipe to be tested,and I aprojecting collar formed upon the inner side of the disk A', for

the partial support of the pipe, and to direct it into proper positionwhile being adjusted in the machine. J is the pipe or opening throughwhich the testing-fluid is introduced to the pipe. K is a pipe throughwhich water is introduced tothe cylinder to operate the machine, and Lthe escape for the same. M is an opening through which water may beintroduced to the cylinder, to drive the piston backward, and N theescape for the same.

Such being the construction of my device,

H represents the its mode of operation is 'as follows: The pipe H issuitably supported in any convenient manner in the position shown in thedrawing. The valves L, M, and N being closed, the valve K is opened, andwater under pressure is introduced to the cylinder. The piston-rod andits disk F are instantly forced hard against the open end of the pipe H.A rubber or other suitable gasket, having previously, if necessary,being fitted to the disk, .water under pressure is then introducedthrough the valve J to the pipe H in the ordinary manner. The operationhaving been completed sufficiently, the valves J and K are closed, andthe valve L opened, the valve N being shut. Water is introduced to theinner side of the piston-head through the valve M, and thus the disk Fis freed from contact with the pipe,

the valves L and N serving to empty the cyl-- inder of Water at theproper time. A

I have found it advantageous to construct the pipe L of considerablelength, as shown in the drawing, by means ofwhich the cylinder can bemore quickly emptied of Water, and

in certain sizes of the machine, the vacuum so formed by the rapiddischarge of the Water will of itself be sufficient to Withdraw thepiston to the outer end of the cylinder Without the necessity of Waterbeing introduced through the valve M.

rllhe advantages of my improvement are apparent. The pressure can beapplied instantly, and to such an extent as` to avoid leakage due toimperfect stoppage of the pipe, as is incident to the ordinary plan ofbringing a disk into contact With the pipe by means of a screw and thelike.

I do not limit myself to the exact form or arrangement of devices shownin the drawing, it being readily seen that a variety of arrangementsembodying the same invention can be made.

Having thus described my invention, I claimf l. In a machine for testingthe strength of pipes, a disk, F,`v actuated by hydrostatic pressure,substantially as shown and described, and for the purpose specified.

2. In a machine for testing the strength of pipes, the combination ofthe disk F, the cylinder C, piston-rod D, and piston-rod head E, 4. Thecombination of the pipe H, the disk substantially as shown anddescribed, and for Af, disk F, piston-rod D, piston-head E, and

the purposes set forth. cylinder C, substantially as shown and de- 3.The piston-rod Dhea,d E, and disk F, in scribed, and for the purposesspecified.

combination with the cylinder C, having valves WALTER WOOD.

K, L, M, and N, one of which, L, is provided Witnesses:

with a pipe, l, substantially as shown and de- NATHL. B. CRENSHAW,

scribed, and for the purposes specied. J.. T. BEYARD.

